I defy any mountain-loving climber to say they can't relate to the lyrics of Ewan McColl's "Joy of Living". If you live in the UK you've probaly been on top of the summits he mentions in the first verse, and maybe even considered having your dust and ashes scattered on some high place, as he sings about in the last.
He wrote it when, as an old man, he finally realised he was too unwell ever again to reach the tops of the hills that he loved so much in life.

i solo alot and am always jamming to something. I like instrumentals, words can so often get in the way, here are some selected favorite bands and albums for motivation-
infected mushroom
tool
frank zappa
juno reactor
charles mingus
"Lunar Crush" with John Medeski and David Fiuczinski
Dj Cheb i Sabbah
Slipknot
"Rise robots Rise" by Rise robots Rise
John Zorn or Edgar Varese, if yer in the mood
anything Persian or from Mali
"Sweet Dreams" by Eurythmics

Soilwork, Hatebreed, Madball, Full Blown Chaos, Fear Factory, Slayer, (OLD Metallica), Static X, old Lamb of God and Shadows Fall just to name a few... Once on a summit, I'll turn off the iPod, or switch over to some Rush.